UN1954 COMPRESSED GAS,FLAMMABLE N.O.S. (METHANE, ETHANE) 2.1 0.01% N-NONANE, 0.02% N-HEPTANE, 0.02% N-OCTANE, 0.03% 2,2-DIMETHYLBUTANE, 0.03% N-HEXANE, 0.1% ISOPENTANE, 0.1% N-PENTANE, 0.3% ISOBUTANE, 0.3% N-BUTANE, 1% CARBON DIOXIDE, 1% PROPANE, 2.5% NITROGEN, 5% ETHANE, METHANE BALANCE CERTIFIED, SIZE 350 CUSTOMER OWNED CYLINDER